Implementation of basic logic gates using CMOS technology: A simulation research

Abstract

CMOS logic gates form the foundation of virtually every digital integrated circuit manufactured today. This research presents simulation-based characterization of fundamental logic gates implemented in 180nm CMOS technology, examining propagation delay, power consumption, and noise margin performance across NOT, NAND, NOR, and XOR configurations [1]. Circuit simulations employed industry-standard SPICE models with accurate parasitic extraction to ensure realistic performance predictions. The NOT gate exhibited the fastest propagation delay at 0.16 ns with power consumption of 9.4 µW at 100 MHz switching frequency. NAND gates demonstrated 0.34 ns delay with 17.8 µW power, representing the preferred implementation for complex logic synthesis due to functional completeness [2]. NOR gates showed 0.51 ns delay and 26.2 µW consumption, while XOR gates required 0.98 ns with 43.7 µW due to increased transistor count. Noise margin analysis confirmed adequate immunity with low noise margin exceeding 0.62 V and high noise margin above 0.71 V for all configurations [3]. Temperature simulations from -40°C to 125°C revealed delay variations within 18% across the range, acceptable for commercial and industrial applications. The power-delay product emerged as a useful figure of merit, with NOT gates achieving 1.50 fJ compared to 6.05 fJ for NAND implementations. These simulation results provide reference data for digital designers selecting appropriate gate implementations and establishing timing constraints in synchronous systems [4].